Pivot-pin-grinding device for watchmakers.



. o, 766,211. PATENTED AUG. 2, 1904. n. ABELES.

- PIVOT PIN GRINDING DEVICE FOR WATGHMAKERS.

APPLICATION FILED JULY 26, 1902.

N0 MODEL.

Inventor.

UNITED j STATES Patented August 2, 1904.

PATENT OEEIcE.

PIVOT-PIN-GRINDING DEVICE FOR WATCHMAKERS- SPECIFICATION forming part ofLetters Patent No. 766,211, dated. August 2, 1904;,

Application filed July 26, 1902. Serial No. 117,114. (No model.)

To all whom it may concern:

Be it known that I, DAVID ABELES, a subject of the Emperor ofAustria-Hungary, residing at VII Seidengasse 44, Vienna,Austria-Hungary, have invented certain new and useful Improvements inPivot-Pin-Grinding Devices for atehmakers, of which the following is aspecification.

This invention relates to mechanism for driy'ing pivot-pin-grindingdevices for watchmakers; and its objects are to produce a simplemechanism for driving the disk or sheave which turns the pin in such amanner that the pin may be turned with a uniform motion and may besecurely held while being ground.

It consists in the novel features set forth hereinafter.

In the drawings, Figure 1 is a front elevation of a pivot-pin-grindingdevice with adjustable driving mechanism; Fig. 2, a transverse sectionon the line a: a; of Fig. 1; Fig. 3, a plan view, partly in section.Figs. 4 and 5 are details of the driving mechanism. Figs. 6 and 7 aremodifications of the construction shown in Fig. l, in side elevation andtransverse seetion', respectively.

As shown in Figs. 1 to 4, the sheave a, which runs loosely on the shaft(1, secured in the ad justable tail-stock spindle L of the tappetdevice, has an annularly-grooved hub and is driven from sheave (Z bymeans of connectingbelt (1. The wheel or sheave (Z is mounted on themain shaft 1' of the driving-train and shiftably secured thereon bymeans of a spline it. Its hub g has an annular groove for the receptionof a saddle f at the junction of the two arms of the right-angled leverf. This lever consists of a bent wire, and the saddle f is formed at thebend of the wire to take into the groove in the hub g. One arm of thislever is fixed in a milled disk I), near the periphery thereof, andextends thence to the hub y, where its saddle permanently engages thegroove, while the other arm extends up from said saddle toward thesheave a and the groove in the hub of the latter. The disk Ithas a splithub 71, which elastically embraces the cylindrical frame-sleeve m. Thissleeve extends rigidly forward from supporting-block Z and forms abearing for main shaft 1', Thus said disk can be slipped along thesleeve or turned therearound with the application of a little force, butwill be securely held in position thereon by its spring-hub when leftalone. Close behind the block I is a pinion 0, fixed to the end of mainshaft 11 and meshing constantly with the gear-wheel p. This latter isfixed to twirling spindle '2', journaled in angular support 1 and whichserves as a driving device for the apparatus, as hereinafter explained.

The angular support or frame-piecc 1 which carries or contains thebearings for the spindle '1' and shaft 1' of the apparatus, includingthe sleeve on, is detaehably secured to the shoe s by means of set-screwt and this latter to the foot-piece n of the frame of the machine by.

set-screw an in the same manner. The former is also slightly revolublearound set-screw t by means of adjusting-screw a, which acts against thelateral surface of the shoe, the extent of such movement being limitedby the pin a: from the shoe taking into the curved slot y in theframe-piece.

A shaft or head-stock 1 is horizontally mounted in the frame with itsaxis in the same plane, but somewhat below the shaft 0. This shaft isprovided at the forward end with heads 9. and 3, havingsegmental groovesof different sizes cut therein, the centers of said grooves being inalinement with the center of the shaft 0. On the opposite end of theshaft 1 is mounted a notched wheel 4, having notches corresponding tothe grooves in the heads 2 and 3. \V hen the wheel l is turned to bringone of the grooves to its upper alining position, it may be locked inposition by means of a pin 5 inserted in the frame of the machine. A pin.2 is fastened at one side of the sheave a and is adapted to engage thearm of a lathe-dog6, which may be secured to the pivot-pin 7 which is tobe ground.

The operation is as follows: The pin or spindle 7 which is to be groundis centered on the shaft 0 and is supported at the opposite end in oneof the grooves of the heads 2 or 3, depending on the size and length ofthe pin. Thus if a long pin is to be ground one of the notches of thehead 3 is brought into alinement with the center of the shaft 0 and theend of the pin is caused to rest in or be 'ner that the end of the pinis ground-or sharpened, as desired. The dog 6 is secured.

to the p eif zandien ee w th he ri l-VI means of which it is turned torevolve the pin 5 '7. When the sheavehas been brought intof the properrelation to the-work, the disk lc-is slipped along the sleeve m,carrying with it the right-angled lever and the sheave. duntil; the freearm of'the'le'ver 'is immediately over the groove in the hub of thetappet-sheave. 3

Then said disk is revolved around sleeve untilthe upper: endfof .thelever engages in sald groove, thus locking the two sheaves in} alinementwith each other 'a ndby the resilint engagement of the disk with thesleeve. holdin'gtthem in adjusted position. Then by loosening theset-screw Z and setting up adjustirig-screw a the belt isproperlytightened; after which the frame-piece isia'gain :fiXed in:position'by tighteningdo wn set screw t, and the apparatus is readyfo raction. 'j The .device'isv driven bygsimply. rotating twirling spindle?betweenthe'thumb' and'fore-' finger. of onehand while the other-isengaged" with the work. L Thi slcommunicates motion through gear p,pinion '0, shaft z', s"heave' (1,1 and: belt 6 to the sheave a. aInstead ofthe belt-driver the apparatus may be driven byfrictiOh-Wheelsa cl, adjustable by screw to, as shown in Figs. 6:and. 7.=t;. Y

Having thus described my invention, what.

I claim as new, and desire to secure b-y Letters Patent, is'.

The combination with the. adjuistablei .pivot-pin-holdinggsheave havingan annu sleeve-bearing and having a split hub elas .tically embracingthe sleeve, theright-anpgled 'barthaving one arm securedlgtopaid disk,

:and having a saddle at its angle fitting into "g'the groove i n hub ofwheel d and the other.

ar-In extending up to engage the groove in liub of the sheave, and atwirling spindle for .1

lcommunicating motion to saidshafit wheel 'and'through the latter to thesheave.

QI The combination with the spindle or fpivot-pin-holding sheave, anditsdriving sheave and the main shaft t-o"-which' *i'tj is- ;'splined, ofthe belt connecting the' two, the

angular frame-piece, the sleeve-bearing X-'-' l tending from said framepiece toreceivethe i main shaft, the elastically clasping diskslidadapted to engage a groove in the 'hub'ofthe' fl spindle-sheave, theshoe, the set screiv clamp- ;ing the frame-piece to the 'shoe theadjust-f fling-screw to tighten theibe lt by rocking the fframe-ioieceon said set-screw as aip'ivot, the. twirling spindle having bearing onthe frame-I i piece, the spur-gear on saidspindle andthe spur pinion onthe rear end of the main'shai'ta i In' witness whereof I have hereuntosigned presence of two subscribing witnesses.

. x -D'A'VID ABELES. Witnesses:. i

' AUG: T. KNoPscnNAc ER, i zALvEs'ro S H UE.

